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Nix ignores an input that --override-input names but the flake doesn't
have, with a warning, so a misspelt input name in inputs draws nothing,
and the source keeps using its own input.
Before changing anything, populate locks the flake of each source that
draws inputs, with an empty flake in place of each input drawn, which
may be unreachable, and fails, naming the source and the input, unless
the flake has each input drawn. Below an input drawn from a source, the
path continues in the flake of that source.
An edge case misspells an input of the source's flake, and one below an
input drawn from a source, both ways of drawing inputs.
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inputs
Delivering flakes and flake inputs gets more robust:
- With fetchOnTarget, the inputs get collected before the pipeline that
links them, so populate fails if the target can't fetch one, instead of
linking the flake without its inputs and succeeding.
- What the lock file pins gets taken from the store if it's there: the
store path is the one of a directory named source with the locked hash,
which nix-store --print-fixed-path computes. builtins.fetchTree
contacts where the input comes from even then, so redeploying unchanged
sources fails without that if a server is unreachable.
- With fetchOnTarget, a delivered input that is itself locked to a local
path the target lacks fails with populate's error naming the input, like
its inputs do.
- Inputs that get drawn from other sources are left out, with all they
pin: Nix archives an empty flake in their place. So nothing gets
fetched, copied, and rooted that no evaluation uses, and a pin that is
unreachable doesn't matter if it gets replaced anyway.
- flake-input sources get the option requireInputs. By default,
populating fails if the inputs that the input's own lock file pins
can't be delivered, e.g. because the lock file lacks an input its
flake.nix has. With false, populate warns and delivers the input with
what Nix locks now, or else without its inputs.
A remote flake that the target fetches entirely on its own collects its
inputs like everything else does. The Nix function finding its
subdirectory moves next to the jq programs.
New edge cases cover each of these.
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Depending on the version of Nix, lock files name subdirectories as
attribute dir or as query parameter dir of the URL. The VM tests run
one version, so only one shape gets covered there. The jq programs for
flakes move to pkgs/populate/flake-jq.nix, and a new test, jq, runs them
without VMs over lock files of both shapes, with follows, removed and
cyclic follows, and inputs given by relative paths.
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